Moldable material.



' Ito Drawing.

J'MMES 1?. .d. M00032, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO 'WlElS'lHl'Gl-HOUSE ELECTRIC'ANJD MANUFACTURING COMPANY, A'CORJPORATION OF PENNSYLVANIA.

MOLDAJBLE MATERIAL.

To all whom it may concern:

Be it known that 1, JAMES P. A. MCCOY, a subject of the King of Great Britain, and a resident of Wilkinsbur in the county of Allegheny and State of ennsylvania, have invented a new and useful Improvement in Moldable Materials, of which the following is a specification.

My invention relates to the manufacture of molded materials, and it has special reference to methods and compositions pertaining to the manufacture of molded electrical insulation.

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The objects of my invention are to prepare a novel, effective and inexpensive material of high insulating efiiciency and to form such material into molded articles which shall have superior physical properties.

The compositions to which my invention relates are of the type that consists of a relatively large amount of a filling material, such as asbestos, silica, wood flour and the like, united into a compact mass by means of a relatively small amount of binder. According to my present invention, I produce aparticularly eflicient composition of this class by combining comminuted asbestos or other suitable filler with a polymerizable vegetable oil and then efi'ecting the polymerization of the oil, thereby firmly binding together the particles of the filler. I prefer to make use of an oil which polymerizes throughout its whole mass at substantially the same time, as distinguished from drying oils, such as linseed oil, which dry by a process of oxidation and which therefore form films on their surfaces. Chinawood oil, or tung oil, is well suited. to my present purpose, since this oil, upon heating, polymerizes simultaneously throughout its whole mass. Sterculia oil, or oil of Java olives may also be used.

In preparing molding mixtures from comminuted asbestos and a polymerizable oil such as China wood oil, about 90 parts of the asbestos may be intimately mixed with about 10 parts of the oil and sufficient solvent to form a pulp. This mixture has little or no flowing property and, therefore, the

-. plates or other objects to-be molded must be pre-shaped and dried before being subjected to the final molding treatment. The preshaped articles are placed in molds and Specification of Letters Patent.

Patented May 2%, this.

Application filed March 80, 1915. Serial No. 18,151.

vstrength and are very resistant to mechanical shocks. The molding operation imparts an excellent polish to the molded articles and they may be sawed, out or turned into any desired forms.

The proportions of the ingredients set forth I above may be varied considerably without departing from the scope 'of my in vention, and the manipulations to which the material is sub ected may also be readily varied by persons skilled in the molding art. It is, therefore, to be understood that no limitations are to be imposed upon my invention unless indicated in the appended claims. 7

I claim as my invention:

1. The process of making molded articles that comprises mixing an inert filler with a vegetable-oil that polymerizes substantially simultaneously throughout its mass, effect ing the polymerization of the said oil, and molding the resulting mixture.

2. The process of making molded articles that comprises mixing eo-mminuted asbestos with raw China wood oil, effecting the p0lymerization of the said oil, and molding the resulting mixture.

3. The process of making molded articles that comprises mixing a filler'with a relatively small amount of a polymerizable vegetable oil, pro-shaping the mixture and hotmolding the pre-shaped articles.

4. The process of making molded articles" and hot-molding the pre shaped articles.

" minute'd asbestos, a out 10- parts of raw China wood oil and a relatively small amount of a sticky binder, pre-shaping the mixture and hot-molding the pre-shaped articles.

7. A moldable composition containing a comminuted inert filler and a vegetable oil that polymerizes substantially simultaneously throughout its whole mass.

8. A moldable composition containin colmminuted asbestos and raw China W0 0 9. A moldable composition containin comminuted asbestos, raw China wood 01 15 and a relatively small amount of a sticky binder. I

10. A moldable composition containin oomminuted asbestos, raw China wood 011 and a relatively small amount of coal tar 20 pitch.

In testimony whereof, I have hereunto subscribed my name this 27th day of March,

JAMES P. A. MCCOY. 

